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apparmor: add mkdir/rmdir interface to manage policy namespaces

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When setting up namespaces for containers its easier for them to use
an fs interface to create the namespace for the containers
policy. Allow mkdir/rmdir under the policy/namespaces/ dir to be used
to create and remove namespaces.

BugLink: http://bugs.launchpad.net/bugs/1611078

Signed-off-by: John Johansen <john.johansen@canonical.com>
This commit is contained in:
John Johansen 2017-05-26 16:45:48 -07:00
parent d9bf2c268b
commit 4ae47f3335
1 changed files with 94 additions and 1 deletions
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95
security/apparmor/apparmorfs.c
View file

@ -1322,6 +1322,97 @@ int __aafs_profile_mkdir(struct aa_profile *profile, struct dentry *parent)
return error;
}
static int ns_mkdir_op(struct inode *dir, struct dentry *dentry, umode_t mode)
{
struct aa_ns *ns, *parent;
/* TODO: improve permission check */
struct aa_profile *profile = aa_current_profile();
int error = aa_may_manage_policy(profile, NULL, AA_MAY_LOAD_POLICY);
if (error)
return error;
parent = aa_get_ns(dir->i_private);
AA_BUG(d_inode(ns_subns_dir(parent)) != dir);
/* we have to unlock and then relock to get locking order right
* for pin_fs
*/
inode_unlock(dir);
error = simple_pin_fs(&aafs_ops, &aafs_mnt, &aafs_count);
mutex_lock(&parent->lock);
inode_lock_nested(dir, I_MUTEX_PARENT);
if (error)
goto out;
error = __aafs_setup_d_inode(dir, dentry, mode | S_IFDIR, NULL,
NULL, NULL, NULL);
if (error)
goto out_pin;
ns = __aa_find_or_create_ns(parent, READ_ONCE(dentry->d_name.name),
dentry);
if (IS_ERR(ns)) {
error = PTR_ERR(ns);
ns = NULL;
}
aa_put_ns(ns); /* list ref remains */
out_pin:
if (error)
simple_release_fs(&aafs_mnt, &aafs_count);
out:
mutex_unlock(&parent->lock);
aa_put_ns(parent);
return error;
}
static int ns_rmdir_op(struct inode *dir, struct dentry *dentry)
{
struct aa_ns *ns, *parent;
/* TODO: improve permission check */
struct aa_profile *profile = aa_current_profile();
int error = aa_may_manage_policy(profile, NULL, AA_MAY_LOAD_POLICY);
if (error)
return error;
parent = aa_get_ns(dir->i_private);
/* rmdir calls the generic securityfs functions to remove files
* from the apparmor dir. It is up to the apparmor ns locking
* to avoid races.
*/
inode_unlock(dir);
inode_unlock(dentry->d_inode);
mutex_lock(&parent->lock);
ns = aa_get_ns(__aa_findn_ns(&parent->sub_ns, dentry->d_name.name,
dentry->d_name.len));
if (!ns) {
error = -ENOENT;
goto out;
}
AA_BUG(ns_dir(ns) != dentry);
__aa_remove_ns(ns);
aa_put_ns(ns);
out:
mutex_unlock(&parent->lock);
inode_lock_nested(dir, I_MUTEX_PARENT);
inode_lock(dentry->d_inode);
aa_put_ns(parent);
return error;
}
static const struct inode_operations ns_dir_inode_operations = {
.lookup = simple_lookup,
.mkdir = ns_mkdir_op,
.rmdir = ns_rmdir_op,
};
static void __aa_fs_list_remove_rawdata(struct aa_ns *ns)
{
struct aa_loaddata *ent, *tmp;
@ -1429,7 +1520,9 @@ static int __aafs_ns_mkdir_entries(struct aa_ns *ns, struct dentry *dir)
aa_get_ns(ns);
ns_subremove(ns) = dent;
dent = aafs_create_dir("namespaces", dir);
/* use create_dentry so we can supply private data */
dent = aafs_create("namespaces", S_IFDIR | 0755, dir, ns, NULL, NULL,
&ns_dir_inode_operations);
if (IS_ERR(dent))
return PTR_ERR(dent);
aa_get_ns(ns);